There are several ways to accomplish this, but most firewalls use two or more of the following methods as none of them alone provides adequate security. The dangers posed by a listening port could range anywhere from leaking certain information about your operating system to a malicious connection to your computer or a Denial of Service attack.Ī firewall is a system designed to reinforce the security of the data flowing between two Networks: the Internal Network and the outside Network. You can find a comprehensive explanation of ports that are assigned to certain services here and on a lot of other sites on the Internet. It is possible for you to close some of them, such as port 139, which is used by file and print sharing, without a firewall, but some can't be closed, such as port 135 (the Endpoint Mapper), unless you have a firewall. However, there are certain ports on your computer that will be listening for connection by default. This means a single scan of a port or ports by itself can do no harm to you whatsoever even if you don't have a firewall. What's important to know is that unless you are running a service on a port and your computer is listening for a connection to that port, it would be virtually impossible to connect to that port, and the response to the port scan will always be a closed response. In order for hackers to actually establish a connection and run commands on your computer, they need additional tools. Port scanners simply determine if the port is listening for connection. The ports may differ, but the process is the same. It's an attempt to reach a certain port in order to determine whether the port accepts a connection. Certain services use a standard port to establish a connection, and other programs may pick up the first port your operating system assigns to them.įor example, if you run a web server on your computer, the port scan is very similar to what your browser does. There are over 65,000 ports available to a TCP/IP stack on a computer. Each TCP/IP communication needs to originate from a port on one computer and go to a port on another computer to establish a connection. Ports are connection portals to a computer. In order to understand what a port scan is, we first need to explain what a port is. Scam Email: What is Phishing? What do I do about it?.How to report ID theft, fraud, drive-by installs, hijacking and malware?.How do I report online child abuse or child pornography?.Is there anything else I can do to protect myself from viruses in emails?.How Do I Remove Trojan Vundo/Winfixer/Virtumonde?.How do I avoid online credit / debit card fraud?.How do I recover from Hosts file hijacking?.What questions should I ask when doing a security assessment?.When should I re-format? How should I reinstall?.How do I prevent browser hijacks and spyware?.What do I do about bounced e-mail and virus e-mail?.
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